We should not involve any platform specific stuff in this documentation.how about "Attribute is only present for zones in which the passivecooling policy is not supported by native thermal driver"

> Default is zero and can be> + set to a temperature (in millidegrees) to enable a passive trip> + point for the zone. Activation is done by polling with an interval> + of 1 second.> + Unit: millidegrees Celsius> + RW, Optional> +> *****************************> * Cooling device attributes *> *****************************> @@ -230,8 +239,9 @@ thermal_zone_device (thermal_zone1) with 4 trip points in all.> It has one processor and one fan, which are both registered as> thermal_cooling_device.> > -If the processor is listed in _PSL method, and the fan is listed in _AL0> -method, the sys I/F structure will be built like this:> +If the processor is listed in _PSL method, the fan is listed in _AL0> +method, and the zone has a _PSV method, the sys I/F structure will be> +built like this:> For an ACPI thermal zone, supporting passive cooling means that both_PSL and _PSV are available.so I don't think we need to change this. :)